Around 90% of London’s restaurants and takeaways are feeding the sewers’ monstrous ‘fatbergs’ by letting grease, oil and scraps slide down their waste systems.

After visiting hundreds of food outlets across the capital, Thames Water found that the majority had no system for dealing with excess gunk.

On Whitechapel Road – where a huge 130-tonne blockage was recently found – no restaurants had a working grease trap.

Thames Water, which spends around £1million a month cleaning sewers, said the findings were ‘staggering’.

Around 90% of restaurants are contributing to this (Picture: PA)

Sewer network manager Stephen Pattenden said: ‘We’re not suggesting anyone intentionally pours the contents of a fat fryer down the drain, but it’s more about the gunk that comes from dirty plates, pots and pans.